Vantage was a "novel approach to light weight towing, intended to appeal to the "Airstream followers" at a cheaper price point... It was also one of the first steps into using NORCO stamped frames. The frame is extremely light weight, mostly held together with Huck fasteners (not welded). The trailers had some very innovative design features, both in how the trailer was built and also how it was equipped.
You can download the 2013 Vantage brochure here:
https://www.keystonerv.com/media/2377/vantage-2013.pdf There was no Vantage brochure in 2012 nor in 2014, so it appears it was only "marketed by Keystone" in 2013 (which really means from around April 2012, when the 2013 models were introduced, through around March or April 2013, when the 2014 models hit the dealership lots.
Whether it will become a classic or a dinosaur ??? Like vintage Mustangs and Camaros or more like Furys and Belvederes, they will have a following, but how much value they hold and the collector's desire ???? Who knows....